Add Buffer:clear, to reset all or part of a Buffer's contents to 0.

src/modules/graphics/vulkan/Buffer.cpp

@@ -254,6 +254,20 @@ void Buffer::unmap(size_t usedoffset, size_t usedsize)
 	}
 }
 
+void Buffer::clear(size_t offset, size_t size)
+{
+	if (isImmutable())
+		throw love::Exception("Cannot clear an immutable Buffer.");
+	else if (isMapped())
+		throw love::Exception("Cannot clear a mapped Buffer.");
+	else if (offset + size > getSize())
+		throw love::Exception("The given offset and size parameters to clear() are not within the Buffer's size.");
+	else if (offset % 4 != 0 || size % 4 != 0)
+		throw love::Exception("clear() must be used with offset and size parameters that are multiples of 4 bytes.");
+
+	vkCmdFillBuffer(vgfx->getCommandBufferForDataTransfer(), buffer, offset, size, 0);
+}
+
 void Buffer::copyTo(love::graphics::Buffer *dest, size_t sourceoffset, size_t destoffset, size_t size)
 {
 	auto commandBuffer = vgfx->getCommandBufferForDataTransfer();